EP3643925A1 - Electric air blower, electric vacuum cleaner, and hand drier device - Google Patents
Electric air blower, electric vacuum cleaner, and hand drier device Download PDFInfo
- Publication number
- EP3643925A1 EP3643925A1 EP17914605.5A EP17914605A EP3643925A1 EP 3643925 A1 EP3643925 A1 EP 3643925A1 EP 17914605 A EP17914605 A EP 17914605A EP 3643925 A1 EP3643925 A1 EP 3643925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric blower
- air
- path
- motor
- mixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/06—Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/165—Axial entry and discharge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4253—Fan casings with axial entry and discharge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/50—Inlet or outlet
- F05B2250/502—Outlet
Definitions
- the present invention relates to an electric blower.
- An electric blower including a blade as a moving blade, and a motor to drive the blade is generally used.
- a vent path air path
- a semiconductor element is disposed in a vent path formed between a brushless motor and an outer casing serving as a housing.
- Patent Reference 1 Japanese Patent Application Publication No. H11-336696 (see FIG. 3 )
- a pressure loss is likely to occur when a current of air (to be also referred to as an air current hereinafter) generated by the moving blade flows to the downstream side of the moving blade.
- An increase in pressure loss causes a reduction in aerodynamic efficiency of the electric blower.
- An electric blower includes an air blowing unit including a mixed-flow fan to generate a current of air, a permanent magnet synchronous motor to rotate the mixed-flow fan, and a housing including a first opening, a second opening communicating with the first opening, a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the permanent magnet synchronous motor in the circumferential direction.
- An inner diameter of the second portion is smaller than an inner diameter of the first portion.
- an electric blower having high aerodynamic efficiency can be provided.
- FIGS. 1 and 2 are sectional views schematically illustrating a structure of an electric blower 1 according to Embodiment 1 of the present invention. More specifically, FIG. 2 is a diagram illustrating a state that the electric blower 1 illustrated in FIG. 1 is rotated in the circumferential direction.
- the "circumferential direction” means the direction indicated by an arrow D1 illustrated in FIG. 3 , and it is, for example, a rotation direction of a moving blade 31.
- the electric blower 1 includes a motor 10, a housing 20, and an air blowing unit 30.
- the motor 10 is, for example, a permanent magnet synchronous motor.
- a motor other than the permanent magnet synchronous motor may be used.
- the permanent magnet synchronous motor means a synchronous motor including a permanent magnet (ferromagnet), which is used for a field magnet.
- the motor 10 includes a motor frame 11 (also simply called a frame), a stator 12, a rotor 13, a shaft 14, bearings 15a and 15b, and a stationary blade support portion 16 ( FIG. 2 ).
- the housing 20 includes a first portion 21, a second portion 22, a third portion 23, a fourth portion 24, a motor support portion 25, a first opening 26a, and a second opening 26b communicating with the first opening 26a.
- the air blowing unit 30 includes a moving blade 31 that rotates and a stationary blade 32 that does not rotate.
- the air blowing unit 30 generates a current of air.
- the moving blade 31 is, for example, a mixed-flow fan.
- the mixed-flow fan means a fan to generate an air current in a direction inclined with respect to the axis of rotation of the moving blade.
- the moving blade 31 rotates in accordance with rotation of the motor 10 (more specifically, the rotor 13 and the shaft 14).
- the stator 12 is fixed to the interior (inner wall) of the motor frame 11.
- the rotor 13 is rotatably inserted inside the stator 12 with a gap in between.
- One end of the shaft 14 is fixed to a shaft hole formed in the rotor 13.
- the other end of the shaft 14 is rotatably inserted into the bearings 15a and 15b and fixed to the moving blade 31.
- the stationary blade support portion 16 is fixed to the motor frame 11 and supports the stationary blade 32.
- the housing 20 has a cylindrical shape. In other words, the interior of the housing 20 is hollow.
- the first portion 21 surrounds the moving blade 31 in the circumferential direction.
- the second portion 22 surrounds the motor 10 in the circumferential direction.
- the third portion 23 is provided between the first portion 21 and the second portion 22.
- the third portion 23 is formed integrally with the first portion 21 and the second portion 22.
- the fourth portion 24 is formed to face the moving blade 31, and forms the first opening 26a.
- the fourth portion 24 is formed integrally with the first portion 21.
- the motor support portion 25 supports the motor 10.
- FIG. 3 is a sectional view taken along a line C3 - C3 in FIG. 2 .
- the inner diameter r2 of the second portion 22 is smaller than the inner diameter r1 of the first portion 21, as illustrated in FIGS. 1 and 3 .
- a current of air in the electric blower 1 will be described below.
- FIG. 4 is a diagram illustrating a current of air generated by rotation of the moving blade 31 in the electric blower 1.
- the electric blower 1 includes a first path 41 through which air passes, a second path 42 through which the air having passed through the first path 41 passes, and a third path 43 through which the air having passed through the second path 42 passes.
- the first path 41 is formed between the housing 20 (more specifically, the first portion 21) and the air blowing unit 30 (more specifically, the stationary blade 32).
- the second path 42 is formed between the first path 41 and the third path 43.
- the third path 43 is formed between the housing 20 (more specifically, the second portion 22) and the motor 10 (more specifically, the motor frame 11).
- the air current generated by the moving blade 31 passes through the stationary blade 32 and flows into the first path 41.
- the air flows in a first direction D1.
- the first direction D1 is a direction parallel to the shaft 14.
- the first direction D1 is a direction from the first opening 26a to the second opening 26b and a direction parallel to the X-axis.
- the first direction D1 need not always be exactly parallel to the shaft 14.
- the air having passed through the first path 41 flows into the second path 42.
- the air flows in a second direction D2.
- the second direction D2 is along the inner surface of the third portion 23 on the X-Z plane.
- the second direction D2 is a direction from the first opening 26a to the second opening 26b and a direction along the inner surface of the third portion 23.
- the air having passed through the second path 42 flows into the third path 43.
- the third path 43 is formed between the second portion 22 and the motor 10.
- the air flows in a third direction D3.
- the third direction D3 is a direction parallel to the shaft 14.
- the third direction D3 is a direction from the first opening 26a to the second opening 26b and a direction parallel to the X-axis.
- the first direction D1 and the third direction D3 are parallel to each other.
- the third direction D3 need not always be exactly parallel to the shaft 14.
- the air having passed through the third path 43 is exhausted outside the electric blower 1 from the second opening 26b.
- FIG. 5 is a sectional view schematically illustrating a structure of an electric blower 1a according to Modification 1 to Embodiment 1.
- the electric blower 1a according to Modification 1 is different from the electric blower 1 according to Embodiment 1 in that a motor frame 11a of a motor 10a includes a through hole 17, and these two electric blowers are the same in other respects.
- At least one through hole 17 for cooling the motor 10a (more specifically, the interior of the motor 10a) is formed at an end of the motor frame 11a in the rotation axis direction (the X-axis direction in FIG. 5 ).
- the air having passed through the second path 42 flows into the third path 43 and further flows into the interior of the motor frame 11a through the through hole 17.
- the air having flowed into the interior of the motor frame 11a passes through a through hole (air path) formed in the stator 12 and the air gap between the rotor 13 and the stator 12, and is exhausted outside the motor 10a. This makes it possible to cool the motor 10a, and to improve the stability of the electric blower 1a.
- FIGS. 6 and 7 are sectional views schematically illustrating a structure of an electric blower 1b according to Modification 2 to Embodiment 1.
- FIG. 7 is a diagram illustrating a state that the electric blower 1b illustrated in FIG. 6 is rotated in the circumferential direction.
- a motor 10b (more specifically, the arrangement of bearings 15a and 15b, and the structure of a motor frame 11b) is different from the motor 10 of the electric blower 1 according to Embodiment 1, and these two electric blowers are the same in other respects.
- the bearings 15a and 15b are fixed on both sides of the motor frame 11b respectively in the rotation axis direction (the X- axis direction in the example illustrated in FIGS. 6 and 7 ).
- the rotor 13 and the shaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of the motor 10b.
- FIG. 8 is a sectional view schematically illustrating a structure of an electric blower 1c according to Modification 3 to Embodiment 1.
- a motor 10c (more specifically, the arrangement of bearings 15a and 15b, and the structure of a motor frame 11c) is different from the motor 10 of the electric blower 1 according to Embodiment 1, and these two electric blowers are the same in other respects.
- a plurality of through holes 17 for cooling the motor 10c are formed at both ends of the motor frame 11c in the rotation axis direction (the X-axis direction in FIG. 8 ).
- the air having passed through the second path 42 flows into the third path 43 and further flows into the interior of the motor frame 11c from the through hole 17 on the side of the first opening 26a.
- the air having flowed into the interior of the motor frame 11c passes through a through hole (air path) formed in the stator 12 and the air gap between the rotor 13 and the stator 12, and is exhausted outside the motor 10c from the through hole 17 on the side of the second opening 26b. This makes it possible to cool the motor 10c, and to improve the stability of the electric blower 1c.
- the bearings 15a and 15b are fixed on both sides of the motor frame 11c respectively in the rotation axis direction (the X-axis direction in the example illustrated in FIG. 8 ).
- the rotor 13 and the shaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of the motor 10c.
- FIGS. 9 , 10 , and 11 are sectional views schematically illustrating a structure of an electric blower 1d as a Comparative Example.
- FIG. 10 is a diagram illustrating a state that the electric blower 1d illustrated in FIG. 9 is rotated in the circumferential direction.
- FIG. 11 is a diagram illustrating a current of air generated by rotation of a moving blade 31 in the electric blower 1d.
- FIGS. 12 and 13 are diagrams schematically illustrating a structure of an electric blower 1e according to a Modification of the electric blower 1d as the Comparative Example.
- FIG. 13 is a diagram illustrating a state that the electric blower 1e illustrated in FIG. 12 is rotated in the circumferential direction.
- a rotor 13 and a shaft 14 are rotatably supported by a both-end support structure.
- the electric blower 1e is the same in other respects as the electric blower 1d illustrated in FIGS. 9 to 11 .
- a housing 20d of the electric blower 1d is different from the housing 20 according to Embodiment 1 (including each Modification). More specifically, the structure of a first portion 21d, a second portion 22d, and a third portion 23d of the housing 20d is different. In other words, the inner diameter r2 of the second portion 22 is equal to the inner diameter r1 of the first portion 21.
- the electric blower 1d like the electric blower 1 according to Embodiment 1, the air current passes through the second path 42 and the third path 43 formed outside the motor frame 11 (between the housing 20d and the motor 10). There is no obstacle that blocks the air current in the second path 42 and the third path 43, the same as in the electric blower 1 according to Embodiment 1, and therefore it is possible to prevent deterioration of aerodynamic efficiency.
- the widths of the second path 42 and the third path 43 are small. More specifically, the inner diameter r2 of the second portion 22 is smaller than the inner diameter r1 of the first portion 21. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, an increase in pressure loss when the air current generated by the moving blade 31 flows from the first path 41 into the second path 42 is kept down, and the aerodynamic efficiency is thus improved. Accordingly, the electric blower having high aerodynamic efficiency can be provided.
- the rotor 13 and the shaft 14 are rotatably supported by the both-end support structure. This makes it possible to stabilize driving of the motor 10b.
- the motor 10c can be cooled, and the heat radiation effect in the electric blower 1c can thus be enhanced. This makes it possible to improve the stability of the electric blower 1c. Furthermore, since the rotor 13 and the shaft 14 are rotatably supported by the both-end support structure, driving of the motor 10c can be stabilized.
- Embodiment 2 The structure and the operation of an electric blower 2 according to Embodiment 2 will be described below, mainly in terms of differences from the structure and the operation of the electric blower 1 according to Embodiment 1.
- FIGS. 14 and 15 are sectional views schematically illustrating a structure of the electric blower 2 according to Embodiment 2 of the present invention. More specifically, FIG. 15 is a diagram illustrating a state that the electric blower 2 illustrated in FIG. 14 is rotated in the circumferential direction.
- a motor 100 (more specifically, the structure of a motor frame 111) is different from the motor 10 of the electric blower 1 according to Embodiment 1, and these two electric blowers are the same in other respects.
- the same reference numerals as in the elements described in Embodiment 1 (including each Modification) denote the same or equivalent elements.
- the electric blower 2 includes the motor 100, a housing 20, and an air blowing unit 30.
- the motor 100 is, for example, a permanent magnet synchronous motor. However, a motor other than the permanent magnet synchronous motor may be used as the motor 100.
- the motor 100 includes the motor frame 111 (also simply called a frame), a stator 12, a rotor 13, a shaft 14, bearings 15a and 15b, and a stationary blade support portion 16.
- the housing 20 includes a first portion 21, a second portion 22, a third portion 23, a fourth portion 24, a motor support portion 25, a first opening 26a, and a second opening 26b communicating with the first opening 26a.
- the air blowing unit 30 includes a moving blade 31 and a stationary blade 32.
- the air blowing unit 30 generates a current of air.
- the moving blade 31 is, for example, a mixed-flow fan.
- the moving blade 31 is not limited to the mixed-flow fan.
- the motor frame 111 includes a bearing holding portion 112 to hold the bearings 15a and 15b, a stator holding portion 113 to hold the stator 12, and a guide portion 114 (also called a projecting portion).
- the bearing holding portion 112, the stator holding portion 113, and the guide portion 114 are formed integrally with each other.
- the guide portion 114 is provided inside the third portion 23 in the radial direction (a direction perpendicular to the axis of rotation of the moving blade 31) of the electric blower 2, and extends in a second direction D2. In other words, the guide portion 114 faces the third portion 23. In the example illustrated in FIGS. 14 and 15 , the guide portion 114 projects from the stator holding portion 113 toward the air blowing unit 30.
- the inner diameter r2 of the second portion 22 is smaller than the inner diameter r1 of the first portion 21.
- a current of air in the electric blower 2 will be described below.
- FIG. 16 is a diagram illustrating a current of air generated by rotation of the moving blade 31 in the electric blower 2.
- the moving blade 31 rotates, and an air current is thus generated. More specifically, air passes through the first opening 26a from outside the electric blower 2 and flows into the electric blower 2. The air current generated by the moving blade 31 passes through the stationary blade 32 and flows into a first path 41. In the first path 41, the air flows in a first direction D1.
- the air having passed through the first path 41 flows into a second path 42.
- the second path 42 is formed between the third portion 23 and the guide portion 114. Therefore, the guide portion 114 guides the air having passed through the first path 41 in the second direction D2, together with the third portion 23. With this arrangement, during rotation of the moving blade 31, the air having passed through the first path 41 flows in the second direction D2 in the second path 42.
- the air having passed through the second path 42 flows into a third path 43.
- the third path 43 is formed between the second portion 22 and the motor 100 (more specifically, the stator holding portion 113). In the third path 43, the air flows in a third direction D3.
- the air having passed through the third path 43 is exhausted outside the electric blower 2 from the second opening 26b.
- FIGS. 17 and 18 are sectional views schematically illustrating a structure of an electric blower 2a according to Modification 1 to Embodiment 2.
- the electric blower 2a according to Modification 1 is different from the electric blower 2 according to Embodiment 2 in that a motor frame 111a of a motor 100a includes a through hole 17, and these two electric blowers are the same in other respects.
- At least one through hole 17 for cooling the motor 100a is formed in the motor frame 111a.
- the air having passed through the second path 42 flows into the third path 43 and further flows into the interior of the motor frame 111a from the through hole 17.
- the air having flowed into the interior of the motor frame 111a passes through a through hole (air path) formed in the stator 12 and the air gap between the rotor 13 and the stator 12, and is exhausted outside the motor 100a. This makes it possible to cool the motor 100a, and to improve the stability of the electric blower 2a.
- the width t1 of the first path 41 illustrated in FIG. 18 is in a direction perpendicular to the first direction D1 on the X-Z plane.
- the width t2 of the second path 42 illustrated in FIG. 18 is in a direction perpendicular to the second direction D2 on the X-Z plane.
- the width t3 of the third path 43 illustrated in FIG. 18 is in a direction perpendicular to the third direction D3 on the X-Z plane.
- the amount of air flowing into the electric blower 2a is determined by the width t1 of the first path 41 and the inner diameter r1 of the first portion 21.
- the inner diameter r2 of the second portion 22 is smaller than the inner diameter r1 of the first portion 21.
- the width t2 of the second path 42 is desirably larger than the width t1 of the first path 41.
- the width t3 of the third path 43 (in particular, the width of the exit of the third path 43) is desirably larger than the width t1 of the first path 41 and the width t2 of the second path 42. This makes it possible to keep down an increase in air pressure.
- FIGS. 19 and 20 are sectional views schematically illustrating a structure of an electric blower 2b according to Modification 2 to Embodiment 2.
- FIG. 20 is a diagram illustrating a state that the electric blower 2b illustrated in FIG. 19 is rotated in the circumferential direction.
- a motor 100b (more specifically, the arrangement of bearings 15a and 15b, and the structure of a motor frame 111b) is different from the motor 100 of the electric blower 2 according to Embodiment 2, and these two electric blowers are the same in other respects.
- the bearings 15a and 15b are fixed on both sides of the motor frame 111b respectively in the rotation axis direction (the X-axis direction in the example illustrated in FIGS. 18 and 19 ).
- the rotor 13 and the shaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of the motor 100b.
- FIG. 21 is a sectional view schematically illustrating a structure of an electric blower 2c according to Modification 3 to Embodiment 2.
- a motor 100c (more specifically, the arrangement of bearings 15a and 15b, and the structure of a motor frame 111c) is different from the motor 100 of the electric blower 2 according to Embodiment 2, and these two electric blowers are the same in other respects.
- a plurality of through holes 17 for cooling the motor 100c are formed in the motor frame 111c.
- the air having passed through the second path 42 flows into the third path 43 and further flows into the interior of the motor frame 111c from the through hole 17 on the side of the first opening 26a.
- the air having flowed into the interior of the motor frame 111c passes through a through hole (air path) formed in the stator 12 and the air gap between the rotor 13 and the stator 12, and is exhausted outside the motor 100c from the through hole 17 on the side of the second opening 26b. This makes it possible to cool the motor 100c, and to improve the stability of the electric blower 2c.
- the bearings 15a and 15b are fixed on both sides of the motor frame 111c respectively in the rotation axis direction (the X-axis direction in the example illustrated in FIG. 21 ).
- the rotor 13 and the shaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of the motor 100c.
- the electric blower 2 according to Embodiment 2 has the same effect as in the electric blower 1 according to Embodiment 1.
- the electric blower 2 further has the following effect.
- the inner diameter r2 of the second portion 22 is smaller than the inner diameter r1 of the first portion 21.
- the electric blower 2 includes a guide portion 114 facing the third portion 23. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, an increase in pressure loss when the air current generated by the moving blade 31 flows from the first path 41 into the second path 42 is further kept down, and the aerodynamic efficiency is thus further improved.
- the rotor 13 and the shaft 14 are rotatably supported by a both-end support structure. This makes it possible to stabilize driving of the motor 100b.
- Embodiment 3 The structure and the operation of an electric blower 3 according to Embodiment 3 will be described below, mainly in terms of differences from the structure and the operation of the electric blower 1 according to Embodiment 1.
- FIG. 22 is a sectional view schematically illustrating a structure of the electric blower 3 according to Embodiment 3.
- FIG. 23a is a plan view illustrating a structure around the stationary blades 32
- FIG. 23b is a sectional view taken along a line 23b - 23b in FIG. 23a .
- the electric blower 3 according to Embodiment 3 includes at least one baffle plate 33.
- the electric blower 3 is the same in other respects as in Embodiment 1 (more specifically, Modification 1 to Embodiment 1).
- reference numerals assigned to elements that are the same as or correspond to the elements described in Embodiment 1 (including each Modification) are the same as the reference numerals assigned to the elements described in Embodiment 1.
- At least one baffle plate 33 is provided between the stationary blade 32 and the motor 10a.
- the baffle plate 33 guides an air current generated by rotation of the moving blade 31 toward the motor 10a.
- a main plate 34 has a first surface 34a on the front side, and a second surface 34b on the back side.
- a plurality of stationary blades 32 are formed on the first surface 34a, and a plurality of baffle plates 33 are formed on the second surface 34b.
- the plurality of stationary blades 32 and the plurality of baffle plates 33 are spirally arranged to have opposite phases.
- a part of the air current having passed through the first path 41 is guided inside in the radial direction by the baffle plate 33. This allows the part of the air current having passed through the first path 41 to readily flow into the motor frame 11a.
- FIG. 24 is a sectional view schematically illustrating a structure of an electric blower 3 according to a Modification to Embodiment 3.
- the electric blower 3a according to the Modification is different in the structure of a motor frame 111a from the electric blower 3 according to Embodiment 3, and these two electric blowers are the same in other respects.
- the structure and the function of the motor frame 111a are the same as those in Modification 1 to Embodiment 2.
- the electric blower 3a according to the Modification includes a guide portion 114 facing the third portion 23. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, compared to the electric blower 3 according to Embodiment 3, an increase in pressure loss when the air current generated by the moving blade 31 flows from the first path 41 into the second path 42 is further kept down, and the aerodynamic efficiency is thus improved more.
- the electric blower 3 according to Embodiment 3 has the same effect as in the electric blower 1 according to Embodiment 1.
- the electric blower 3 further has the following effect.
- the electric blower 3 according to Embodiment 3 allows a part of the air current having passed through the first path 41 to readily flow into the motor frame 11a. This makes it possible to enhance the heat radiation effect in the motor 10a.
- FIG. 25 is a side view schematically illustrating a vacuum cleaner 5 according to Embodiment 4.
- the vacuum cleaner 5 includes a main body 51, a dust chamber 52 to collect dust, a duct 53, a suction nozzle 54, and a gripping portion 55.
- the main body 51 includes an electric blower 51a to produce suction force (suction air), and an exhaust port 51b.
- the electric blower 51a is identical to the electric blower 1 according to Embodiment 1 (including each Modification), the electric blower 2 according to Embodiment 2 (including each Modification), or the electric blower 3 according to Embodiment 3 (including each Modification).
- the dust chamber 52 is mounted on the main body 51. However, the dust chamber 52 may be provided inside the main body 51.
- the dust chamber 52 is, for example, a container including a filter to separate dust and air.
- the suction nozzle 54 is mounted at the distal end of the duct 53.
- the vacuum cleaner 5 according to Embodiment 4 includes the electric blower described in any of Embodiments 1 to 3, and therefore has the same effect as that described in any of Embodiments 1 to 3.
- the vacuum cleaner 5 according to Embodiment 4 since an increase in pressure loss in the electric blower 51a is kept down and the aerodynamic efficiency is thus improved, the vacuum cleaner having high suction power can be provided.
- FIG. 26 is a perspective view schematically illustrating a hand dryer 6 as a hand drying device according to Embodiment 5.
- the hand dryer 6 serving as a hand drying device includes a housing 61 (also called a casing) and an electric blower 64.
- the housing 61 includes an air inlet 62 and an air outlet 63.
- the electric blower 64 is fixed in the housing 61.
- the electric blower 64 is the electric blower 1 according to Embodiment 1 (including each Modification), the electric blower 2 according to Embodiment 2 (including each Modification), or the electric blower 3 according to Embodiment 3 (including each Modification).
- the electric blower 64 performs air suction and blowing air by generating an air current. More specifically, the electric blower 64 sucks up air exterior to the housing 61 through the air inlet 62 and sends the air outside the housing 61 through the air outlet 63.
- the hand dryer 6 according to Embodiment 5 includes the electric blower described in any of Embodiments 1 to 3, and therefore has the same effect as that described in any of Embodiments 1 to 3.
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Abstract
Description
- The present invention relates to an electric blower.
- An electric blower including a blade as a moving blade, and a motor to drive the blade is generally used. When the blade and the motor are surrounded by a housing, for example, it is possible to form, between the housing and the motor, a vent path (air path) as a path through which an air current generated by the moving blade passes. In, for example, an electric blower disclosed in
patent reference 1, a semiconductor element is disposed in a vent path formed between a brushless motor and an outer casing serving as a housing. With this arrangement, a proposal is made to cool the semiconductor element by an air current passing through the vent path, and downsize the electric blower. - Patent Reference 1: Japanese Patent Application Publication No.
H11-336696 FIG. 3 ) - However, in an electric blower having a structure in which the width of a portion covering a motor is equal to or larger than the width (the width in the radial direction) of a portion covering a moving blade, a pressure loss is likely to occur when a current of air (to be also referred to as an air current hereinafter) generated by the moving blade flows to the downstream side of the moving blade. An increase in pressure loss causes a reduction in aerodynamic efficiency of the electric blower.
- It is an object of the present invention to provide an electric blower having high aerodynamic efficiency.
- An electric blower according to the present invention includes an air blowing unit including a mixed-flow fan to generate a current of air, a permanent magnet synchronous motor to rotate the mixed-flow fan, and a housing including a first opening, a second opening communicating with the first opening, a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the permanent magnet synchronous motor in the circumferential direction. An inner diameter of the second portion is smaller than an inner diameter of the first portion.
- According to the present invention, an electric blower having high aerodynamic efficiency can be provided.
-
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FIG. 1 is a sectional view schematically illustrating a structure of an electric blower according toEmbodiment 1 of the present invention. -
FIG. 2 is a diagram illustrating a state that the electric blower illustrated inFIG. 1 is rotated in the circumferential direction. -
FIG. 3 is a sectional view taken along a line C3 - C3 inFIG. 2 . -
FIG. 4 is a diagram illustrating a current of air generated by rotation of a moving blade in the electric blower. -
FIG. 5 is a sectional view schematically illustrating a structure of an electric blower according toModification 1 toEmbodiment 1. -
FIG. 6 is a sectional view schematically illustrating a structure of an electric blower according toModification 2 toEmbodiment 1. -
FIG. 7 is a diagram illustrating a state that the electric blower illustrated inFIG. 6 is rotated in the circumferential direction. -
FIG. 8 is a sectional view schematically illustrating a structure of an electric blower according toModification 3 toEmbodiment 1. -
FIG. 9 is a sectional view schematically illustrating a structure of an electric blower as a Comparative Example. -
FIG. 10 is a diagram illustrating a state that the electric blower illustrated inFIG. 9 is rotated in the circumferential direction. -
FIG. 11 is a diagram illustrating a current of air generated by rotation of a moving blade in the electric blower illustrated inFIG. 9 . -
FIG. 12 is a diagram schematically illustrating a structure of an electric blower according to a Modification of the electric blower as the Comparative Example. -
FIG. 13 is a diagram illustrating a state that the electric blower illustrated inFIG. 12 is rotated in the circumferential direction. -
FIG. 14 is a sectional view schematically illustrating a structure of an electric blower according toEmbodiment 2 of the present invention. -
FIG. 15 is a diagram illustrating a state that the electric blower illustrated inFIG. 14 is rotated in the circumferential direction. -
FIG. 16 is a diagram illustrating a current of air generated by rotation of a moving blade in the electric blower. -
FIG. 17 is a sectional view schematically illustrating a structure of an electric blower according toModification 1 toEmbodiment 2. -
FIG. 18 is a sectional view schematically illustrating a structure of the electric blower according toModification 1 toEmbodiment 2. -
FIG. 19 is a sectional view schematically illustrating a structure of an electric blower according toModification 2 toEmbodiment 2. -
FIG. 20 is a diagram illustrating a state that the electric blower illustrated inFIG. 19 is rotated in the circumferential direction. -
FIG. 21 is a sectional view schematically illustrating a structure of an electric blower according toModification 3 toEmbodiment 2. -
FIG. 22 is a sectional view schematically illustrating a structure of an electric blower according toEmbodiment 3. -
FIG. 23a is a plan view illustrating a structure around stationary blades, andFIG. 23b is a sectional view taken along aline 23b - 23b inFIG. 23a . -
FIG. 24 is a sectional view schematically illustrating a structure of an electric blower according to a Modification toEmbodiment 3. -
FIG. 25 is a side view schematically illustrating a vacuum cleaner according to Embodiment 4. -
FIG. 26 is a perspective view schematically illustrating a hand dryer as a hand drying device according toEmbodiment 5. -
FIGS. 1 and2 are sectional views schematically illustrating a structure of anelectric blower 1 according toEmbodiment 1 of the present invention. More specifically,FIG. 2 is a diagram illustrating a state that theelectric blower 1 illustrated inFIG. 1 is rotated in the circumferential direction. The "circumferential direction" means the direction indicated by an arrow D1 illustrated inFIG. 3 , and it is, for example, a rotation direction of a movingblade 31. - The
electric blower 1 includes amotor 10, ahousing 20, and an air blowingunit 30. Themotor 10 is, for example, a permanent magnet synchronous motor. As themotor 10, however, a motor other than the permanent magnet synchronous motor may be used. The permanent magnet synchronous motor means a synchronous motor including a permanent magnet (ferromagnet), which is used for a field magnet. - The
motor 10 includes a motor frame 11 (also simply called a frame), astator 12, arotor 13, ashaft 14,bearings FIG. 2 ). - The
housing 20 includes afirst portion 21, asecond portion 22, athird portion 23, afourth portion 24, amotor support portion 25, a first opening 26a, and a second opening 26b communicating with the first opening 26a. - The air blowing
unit 30 includes a movingblade 31 that rotates and astationary blade 32 that does not rotate. The air blowingunit 30 generates a current of air. The movingblade 31 is, for example, a mixed-flow fan. However, the movingblade 31 is not limited to the mixed-flow fan. The mixed-flow fan means a fan to generate an air current in a direction inclined with respect to the axis of rotation of the moving blade. The movingblade 31 rotates in accordance with rotation of the motor 10 (more specifically, therotor 13 and the shaft 14). - The
stator 12 is fixed to the interior (inner wall) of themotor frame 11. Therotor 13 is rotatably inserted inside thestator 12 with a gap in between. One end of theshaft 14 is fixed to a shaft hole formed in therotor 13. The other end of theshaft 14 is rotatably inserted into thebearings blade 31. The stationaryblade support portion 16 is fixed to themotor frame 11 and supports thestationary blade 32. - The
housing 20 has a cylindrical shape. In other words, the interior of thehousing 20 is hollow. Thefirst portion 21 surrounds the movingblade 31 in the circumferential direction. Thesecond portion 22 surrounds themotor 10 in the circumferential direction. Thethird portion 23 is provided between thefirst portion 21 and thesecond portion 22. Thethird portion 23 is formed integrally with thefirst portion 21 and thesecond portion 22. Thefourth portion 24 is formed to face the movingblade 31, and forms thefirst opening 26a. Thefourth portion 24 is formed integrally with thefirst portion 21. Themotor support portion 25 supports themotor 10. -
FIG. 3 is a sectional view taken along a line C3 - C3 inFIG. 2 . - The inner diameter r2 of the
second portion 22 is smaller than the inner diameter r1 of thefirst portion 21, as illustrated inFIGS. 1 and3 . - A current of air in the
electric blower 1 will be described below. -
FIG. 4 is a diagram illustrating a current of air generated by rotation of the movingblade 31 in theelectric blower 1. - The
electric blower 1 includes afirst path 41 through which air passes, asecond path 42 through which the air having passed through thefirst path 41 passes, and athird path 43 through which the air having passed through thesecond path 42 passes. Thefirst path 41 is formed between the housing 20 (more specifically, the first portion 21) and the air blowing unit 30 (more specifically, the stationary blade 32). Thesecond path 42 is formed between thefirst path 41 and thethird path 43. Thethird path 43 is formed between the housing 20 (more specifically, the second portion 22) and the motor 10 (more specifically, the motor frame 11). - When the
electric blower 1 is powered on, power is supplied to themotor 10 and themotor 10 rotates the movingblade 31. The rotation of the movingblade 31 generates an air current in theelectric blower 1. More specifically, air passes through thefirst opening 26a from outside theelectric blower 1 and flows into theelectric blower 1. During rotation of the movingblade 31, the air flows toward thesecond opening 26b. - More specifically, the air current generated by the moving
blade 31 passes through thestationary blade 32 and flows into thefirst path 41. In thefirst path 41, the air flows in a first direction D1. The first direction D1 is a direction parallel to theshaft 14. In the example illustrated inFIG. 4 , the first direction D1 is a direction from thefirst opening 26a to thesecond opening 26b and a direction parallel to the X-axis. However, the first direction D1 need not always be exactly parallel to theshaft 14. - The air having passed through the
first path 41 flows into thesecond path 42. In thesecond path 42, the air flows in a second direction D2. The second direction D2 is along the inner surface of thethird portion 23 on the X-Z plane. In the example illustrated inFIG. 4 , the second direction D2 is a direction from thefirst opening 26a to thesecond opening 26b and a direction along the inner surface of thethird portion 23. - The air having passed through the
second path 42 flows into thethird path 43. Thethird path 43 is formed between thesecond portion 22 and themotor 10. In thethird path 43, the air flows in a third direction D3. The third direction D3 is a direction parallel to theshaft 14. In the example illustrated inFIG. 4 , the third direction D3 is a direction from thefirst opening 26a to thesecond opening 26b and a direction parallel to the X-axis. In other words, in the example illustrated inFIG. 4 , the first direction D1 and the third direction D3 are parallel to each other. However, the third direction D3 need not always be exactly parallel to theshaft 14. - The air having passed through the
third path 43 is exhausted outside theelectric blower 1 from thesecond opening 26b. -
FIG. 5 is a sectional view schematically illustrating a structure of an electric blower 1a according toModification 1 toEmbodiment 1. - The electric blower 1a according to
Modification 1 is different from theelectric blower 1 according toEmbodiment 1 in that amotor frame 11a of amotor 10a includes a throughhole 17, and these two electric blowers are the same in other respects. - At least one through
hole 17 for cooling themotor 10a (more specifically, the interior of themotor 10a) is formed at an end of themotor frame 11a in the rotation axis direction (the X-axis direction inFIG. 5 ). During rotation of the movingblade 31, the air having passed through thesecond path 42 flows into thethird path 43 and further flows into the interior of themotor frame 11a through the throughhole 17. The air having flowed into the interior of themotor frame 11a passes through a through hole (air path) formed in thestator 12 and the air gap between therotor 13 and thestator 12, and is exhausted outside themotor 10a. This makes it possible to cool themotor 10a, and to improve the stability of the electric blower 1a. -
FIGS. 6 and7 are sectional views schematically illustrating a structure of anelectric blower 1b according toModification 2 toEmbodiment 1.FIG. 7 is a diagram illustrating a state that theelectric blower 1b illustrated inFIG. 6 is rotated in the circumferential direction. - In the
electric blower 1b according toModification 2, amotor 10b (more specifically, the arrangement ofbearings motor frame 11b) is different from themotor 10 of theelectric blower 1 according toEmbodiment 1, and these two electric blowers are the same in other respects. - The
bearings motor frame 11b respectively in the rotation axis direction (the X- axis direction in the example illustrated inFIGS. 6 and7 ). Therotor 13 and theshaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of themotor 10b. -
FIG. 8 is a sectional view schematically illustrating a structure of anelectric blower 1c according toModification 3 toEmbodiment 1. - In the
electric blower 1c according toModification 3, amotor 10c (more specifically, the arrangement ofbearings motor frame 11c) is different from themotor 10 of theelectric blower 1 according toEmbodiment 1, and these two electric blowers are the same in other respects. - A plurality of through
holes 17 for cooling themotor 10c (more specifically, the interior of themotor 10c) are formed at both ends of themotor frame 11c in the rotation axis direction (the X-axis direction inFIG. 8 ). During rotation of the movingblade 31, the air having passed through thesecond path 42 flows into thethird path 43 and further flows into the interior of themotor frame 11c from the throughhole 17 on the side of thefirst opening 26a. The air having flowed into the interior of themotor frame 11c passes through a through hole (air path) formed in thestator 12 and the air gap between therotor 13 and thestator 12, and is exhausted outside themotor 10c from the throughhole 17 on the side of thesecond opening 26b. This makes it possible to cool themotor 10c, and to improve the stability of theelectric blower 1c. - The
bearings motor frame 11c respectively in the rotation axis direction (the X-axis direction in the example illustrated inFIG. 8 ). Therotor 13 and theshaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of themotor 10c. - Effects of the
electric blower 1 according to Embodiment 1 (including effects of the Modifications) will be described below. -
FIGS. 9 ,10 , and11 are sectional views schematically illustrating a structure of anelectric blower 1d as a Comparative Example.FIG. 10 is a diagram illustrating a state that theelectric blower 1d illustrated inFIG. 9 is rotated in the circumferential direction.FIG. 11 is a diagram illustrating a current of air generated by rotation of a movingblade 31 in theelectric blower 1d. -
FIGS. 12 and13 are diagrams schematically illustrating a structure of anelectric blower 1e according to a Modification of theelectric blower 1d as the Comparative Example.FIG. 13 is a diagram illustrating a state that theelectric blower 1e illustrated inFIG. 12 is rotated in the circumferential direction. In theelectric blower 1e, like theelectric blower 1b illustrated inFIGS. 6 and7 , arotor 13 and ashaft 14 are rotatably supported by a both-end support structure. Theelectric blower 1e is the same in other respects as theelectric blower 1d illustrated inFIGS. 9 to 11 . - With respect to the Comparative Example, a
housing 20d of theelectric blower 1d is different from thehousing 20 according to Embodiment 1 (including each Modification). More specifically, the structure of afirst portion 21d, asecond portion 22d, and athird portion 23d of thehousing 20d is different. In other words, the inner diameter r2 of thesecond portion 22 is equal to the inner diameter r1 of thefirst portion 21. In theelectric blower 1d, like theelectric blower 1 according toEmbodiment 1, the air current passes through thesecond path 42 and thethird path 43 formed outside the motor frame 11 (between thehousing 20d and the motor 10). There is no obstacle that blocks the air current in thesecond path 42 and thethird path 43, the same as in theelectric blower 1 according toEmbodiment 1, and therefore it is possible to prevent deterioration of aerodynamic efficiency. - In the
electric blower 1d according to the Comparative Example, since thesecond path 42 and thethird path 43 are extended in the radial direction (for example, the Z-axis direction inFIG. 9 ) of theelectric blower 1d, a pressure loss is likely to occur when the air current generated by the movingblade 31 flows from thefirst path 41 into thesecond path 42. An increase in pressure loss causes a reduction in aerodynamic efficiency of the electric blower. In addition, since the air in thethird path 43 cannot come into contact with themotor frame 11 closely, heat is not sufficiently radiated from themotor 10. - With the
electric blower 1 according toEmbodiment 1, the widths of thesecond path 42 and thethird path 43 are small. More specifically, the inner diameter r2 of thesecond portion 22 is smaller than the inner diameter r1 of thefirst portion 21. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, an increase in pressure loss when the air current generated by the movingblade 31 flows from thefirst path 41 into thesecond path 42 is kept down, and the aerodynamic efficiency is thus improved. Accordingly, the electric blower having high aerodynamic efficiency can be provided. - In addition, since the air in the
third path 43 can come into contact with themotor frame 11 closely, heat can be sufficiently radiated from themotor 10. This makes it possible to prolong the life of the electric blower 1 (more specifically, the motor 10). - With the electric blower 1a according to
Modification 1 toEmbodiment 1, since at least one throughhole 17 for cooling themotor 10a is formed in themotor frame 11a, themotor 10a can be cooled, and the heat radiation effect in the electric blower 1a can thus be enhanced. This makes it possible to improve the stability of the electric blower 1a. - With the
electric blower 1b according toModification 2 toEmbodiment 1, therotor 13 and theshaft 14 are rotatably supported by the both-end support structure. This makes it possible to stabilize driving of themotor 10b. - With the
electric blower 1c according toModification 3 toEmbodiment 1, since the plurality of throughholes 17 for cooling themotor 10c are formed in themotor frame 11c, themotor 10c can be cooled, and the heat radiation effect in theelectric blower 1c can thus be enhanced. This makes it possible to improve the stability of theelectric blower 1c. Furthermore, since therotor 13 and theshaft 14 are rotatably supported by the both-end support structure, driving of themotor 10c can be stabilized. - The structure and the operation of an
electric blower 2 according toEmbodiment 2 will be described below, mainly in terms of differences from the structure and the operation of theelectric blower 1 according toEmbodiment 1. -
FIGS. 14 and15 are sectional views schematically illustrating a structure of theelectric blower 2 according toEmbodiment 2 of the present invention. More specifically,FIG. 15 is a diagram illustrating a state that theelectric blower 2 illustrated inFIG. 14 is rotated in the circumferential direction. - In the
electric blower 2 according toEmbodiment 2, a motor 100 (more specifically, the structure of a motor frame 111) is different from themotor 10 of theelectric blower 1 according toEmbodiment 1, and these two electric blowers are the same in other respects. InEmbodiment 2, the same reference numerals as in the elements described in Embodiment 1 (including each Modification) denote the same or equivalent elements. - The
electric blower 2 includes themotor 100, ahousing 20, and anair blowing unit 30. Themotor 100 is, for example, a permanent magnet synchronous motor. However, a motor other than the permanent magnet synchronous motor may be used as themotor 100. - The
motor 100 includes the motor frame 111 (also simply called a frame), astator 12, arotor 13, ashaft 14,bearings blade support portion 16. - The
housing 20 includes afirst portion 21, asecond portion 22, athird portion 23, afourth portion 24, amotor support portion 25, afirst opening 26a, and asecond opening 26b communicating with thefirst opening 26a. - The
air blowing unit 30 includes a movingblade 31 and astationary blade 32. Theair blowing unit 30 generates a current of air. The movingblade 31 is, for example, a mixed-flow fan. However, the movingblade 31 is not limited to the mixed-flow fan. - The
motor frame 111 includes abearing holding portion 112 to hold thebearings stator holding portion 113 to hold thestator 12, and a guide portion 114 (also called a projecting portion). Thebearing holding portion 112, thestator holding portion 113, and theguide portion 114 are formed integrally with each other. - The
guide portion 114 is provided inside thethird portion 23 in the radial direction (a direction perpendicular to the axis of rotation of the moving blade 31) of theelectric blower 2, and extends in a second direction D2. In other words, theguide portion 114 faces thethird portion 23. In the example illustrated inFIGS. 14 and15 , theguide portion 114 projects from thestator holding portion 113 toward theair blowing unit 30. - As in the
electric blower 1 according toEmbodiment 1, the inner diameter r2 of thesecond portion 22 is smaller than the inner diameter r1 of thefirst portion 21. - A current of air in the
electric blower 2 will be described below. -
FIG. 16 is a diagram illustrating a current of air generated by rotation of the movingblade 31 in theelectric blower 2. - When the
motor 100 is driven, the movingblade 31 rotates, and an air current is thus generated. More specifically, air passes through thefirst opening 26a from outside theelectric blower 2 and flows into theelectric blower 2. The air current generated by the movingblade 31 passes through thestationary blade 32 and flows into afirst path 41. In thefirst path 41, the air flows in a first direction D1. - The air having passed through the
first path 41 flows into asecond path 42. Thesecond path 42 is formed between thethird portion 23 and theguide portion 114. Therefore, theguide portion 114 guides the air having passed through thefirst path 41 in the second direction D2, together with thethird portion 23. With this arrangement, during rotation of the movingblade 31, the air having passed through thefirst path 41 flows in the second direction D2 in thesecond path 42. - The air having passed through the
second path 42 flows into athird path 43. Thethird path 43 is formed between thesecond portion 22 and the motor 100 (more specifically, the stator holding portion 113). In thethird path 43, the air flows in a third direction D3. - The air having passed through the
third path 43 is exhausted outside theelectric blower 2 from thesecond opening 26b. -
FIGS. 17 and18 are sectional views schematically illustrating a structure of anelectric blower 2a according toModification 1 toEmbodiment 2. - The
electric blower 2a according toModification 1 is different from theelectric blower 2 according toEmbodiment 2 in that amotor frame 111a of amotor 100a includes a throughhole 17, and these two electric blowers are the same in other respects. - At least one through
hole 17 for cooling themotor 100a is formed in themotor frame 111a. During rotation of the movingblade 31, the air having passed through thesecond path 42 flows into thethird path 43 and further flows into the interior of themotor frame 111a from the throughhole 17. The air having flowed into the interior of themotor frame 111a passes through a through hole (air path) formed in thestator 12 and the air gap between therotor 13 and thestator 12, and is exhausted outside themotor 100a. This makes it possible to cool themotor 100a, and to improve the stability of theelectric blower 2a. - The width t1 of the
first path 41 illustrated inFIG. 18 is in a direction perpendicular to the first direction D1 on the X-Z plane. The width t2 of thesecond path 42 illustrated inFIG. 18 is in a direction perpendicular to the second direction D2 on the X-Z plane. The width t3 of thethird path 43 illustrated inFIG. 18 is in a direction perpendicular to the third direction D3 on the X-Z plane. - The amount of air flowing into the
electric blower 2a is determined by the width t1 of thefirst path 41 and the inner diameter r1 of thefirst portion 21. The inner diameter r2 of thesecond portion 22 is smaller than the inner diameter r1 of thefirst portion 21. In this case, the width t2 of thesecond path 42 is desirably larger than the width t1 of thefirst path 41. In addition, the width t3 of the third path 43 (in particular, the width of the exit of the third path 43) is desirably larger than the width t1 of thefirst path 41 and the width t2 of thesecond path 42. This makes it possible to keep down an increase in air pressure. -
FIGS. 19 and20 are sectional views schematically illustrating a structure of anelectric blower 2b according toModification 2 toEmbodiment 2.FIG. 20 is a diagram illustrating a state that theelectric blower 2b illustrated inFIG. 19 is rotated in the circumferential direction. - In the
electric blower 2b according toModification 2, amotor 100b (more specifically, the arrangement ofbearings motor frame 111b) is different from themotor 100 of theelectric blower 2 according toEmbodiment 2, and these two electric blowers are the same in other respects. - The
bearings motor frame 111b respectively in the rotation axis direction (the X-axis direction in the example illustrated inFIGS. 18 and19 ). Therotor 13 and theshaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of themotor 100b. -
FIG. 21 is a sectional view schematically illustrating a structure of anelectric blower 2c according toModification 3 toEmbodiment 2. - In the
electric blower 2c according toModification 3, amotor 100c (more specifically, the arrangement ofbearings motor frame 111c) is different from themotor 100 of theelectric blower 2 according toEmbodiment 2, and these two electric blowers are the same in other respects. - A plurality of through
holes 17 for cooling themotor 100c are formed in themotor frame 111c. During rotation of the movingblade 31, the air having passed through thesecond path 42 flows into thethird path 43 and further flows into the interior of themotor frame 111c from the throughhole 17 on the side of thefirst opening 26a. The air having flowed into the interior of themotor frame 111c passes through a through hole (air path) formed in thestator 12 and the air gap between therotor 13 and thestator 12, and is exhausted outside themotor 100c from the throughhole 17 on the side of thesecond opening 26b. This makes it possible to cool themotor 100c, and to improve the stability of theelectric blower 2c. - The
bearings motor frame 111c respectively in the rotation axis direction (the X-axis direction in the example illustrated inFIG. 21 ). Therotor 13 and theshaft 14 are, therefore, rotatably supported by a both-end support structure. This makes it possible to stabilize driving of themotor 100c. - The effect of the
electric blower 2 according to Embodiment 2 (including effects of Modifications) will be described below. - The
electric blower 2 according toEmbodiment 2 has the same effect as in theelectric blower 1 according toEmbodiment 1. Theelectric blower 2 further has the following effect. - In the
electric blower 2 according toEmbodiment 2, the inner diameter r2 of thesecond portion 22 is smaller than the inner diameter r1 of thefirst portion 21. In addition, theelectric blower 2 includes aguide portion 114 facing thethird portion 23. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, an increase in pressure loss when the air current generated by the movingblade 31 flows from thefirst path 41 into thesecond path 42 is further kept down, and the aerodynamic efficiency is thus further improved. - With the
electric blower 2a according toModification 1 toEmbodiment 2, since at least one throughhole 17 for cooling themotor 100a (more specifically, the interior of themotor 100a) is formed in themotor frame 111a, themotor 100a can be cooled, and the heat radiation effect in theelectric blower 2a can thus be enhanced. This makes it possible to improve the stability of theelectric blower 2a. - With the
electric blower 2b according toModification 2 toEmbodiment 2, therotor 13 and theshaft 14 are rotatably supported by a both-end support structure. This makes it possible to stabilize driving of themotor 100b. - With the
electric blower 2c according toModification 3 toEmbodiment 2, since a plurality of throughholes 17 for cooling themotor 100c (more specifically, the interior of themotor 100c) are formed in themotor frame 111c, themotor 100c can be cooled, and the heat radiation effect in theelectric blower 2c can thus be enhanced. This makes it possible to improve the stability of theelectric blower 2c. Furthermore, since therotor 13 and theshaft 14 are rotatably supported by a both-end support structure, driving of themotor 100c can be stabilized. - The structure and the operation of an
electric blower 3 according toEmbodiment 3 will be described below, mainly in terms of differences from the structure and the operation of theelectric blower 1 according toEmbodiment 1. -
FIG. 22 is a sectional view schematically illustrating a structure of theelectric blower 3 according toEmbodiment 3. -
FIG. 23a is a plan view illustrating a structure around thestationary blades 32, andFIG. 23b is a sectional view taken along aline 23b - 23b inFIG. 23a . - The
electric blower 3 according toEmbodiment 3 includes at least onebaffle plate 33. Theelectric blower 3 is the same in other respects as in Embodiment 1 (more specifically,Modification 1 to Embodiment 1). InEmbodiment 3, reference numerals assigned to elements that are the same as or correspond to the elements described in Embodiment 1 (including each Modification) are the same as the reference numerals assigned to the elements described inEmbodiment 1. - In the
electric blower 3, at least onebaffle plate 33 is provided between thestationary blade 32 and themotor 10a. Thebaffle plate 33 guides an air current generated by rotation of the movingblade 31 toward themotor 10a. Amain plate 34 has afirst surface 34a on the front side, and asecond surface 34b on the back side. A plurality ofstationary blades 32 are formed on thefirst surface 34a, and a plurality ofbaffle plates 33 are formed on thesecond surface 34b. The plurality ofstationary blades 32 and the plurality ofbaffle plates 33 are spirally arranged to have opposite phases. - As illustrated in
FIG. 22 , a part of the air current having passed through thefirst path 41 is guided inside in the radial direction by thebaffle plate 33. This allows the part of the air current having passed through thefirst path 41 to readily flow into themotor frame 11a. -
FIG. 24 is a sectional view schematically illustrating a structure of anelectric blower 3 according to a Modification toEmbodiment 3. - The
electric blower 3a according to the Modification is different in the structure of amotor frame 111a from theelectric blower 3 according toEmbodiment 3, and these two electric blowers are the same in other respects. The structure and the function of themotor frame 111a are the same as those inModification 1 toEmbodiment 2. - The
electric blower 3a according to the Modification includes aguide portion 114 facing thethird portion 23. This regulates extension of an air path (for example, the second path 42) in the radial direction. Therefore, compared to theelectric blower 3 according toEmbodiment 3, an increase in pressure loss when the air current generated by the movingblade 31 flows from thefirst path 41 into thesecond path 42 is further kept down, and the aerodynamic efficiency is thus improved more. - The effect of the
electric blower 3 according to Embodiment 3 (including the effect of the Modification) will be described below. - The
electric blower 3 according toEmbodiment 3 has the same effect as in theelectric blower 1 according toEmbodiment 1. Theelectric blower 3 further has the following effect. - The
electric blower 3 according toEmbodiment 3 allows a part of the air current having passed through thefirst path 41 to readily flow into themotor frame 11a. This makes it possible to enhance the heat radiation effect in themotor 10a. - With the
electric blower 3a according to the Modification toEmbodiment 3, since an increase in pressure loss when the air current generated by the movingblade 31 flows from thefirst path 41 into thesecond path 42 is further kept down, the aerodynamic efficiency can further be improved. -
FIG. 25 is a side view schematically illustrating avacuum cleaner 5 according to Embodiment 4. - The
vacuum cleaner 5 includes amain body 51, adust chamber 52 to collect dust, aduct 53, asuction nozzle 54, and a grippingportion 55. - The
main body 51 includes anelectric blower 51a to produce suction force (suction air), and anexhaust port 51b. Theelectric blower 51a is identical to theelectric blower 1 according to Embodiment 1 (including each Modification), theelectric blower 2 according to Embodiment 2 (including each Modification), or theelectric blower 3 according to Embodiment 3 (including each Modification). - The
dust chamber 52 is mounted on themain body 51. However, thedust chamber 52 may be provided inside themain body 51. Thedust chamber 52 is, for example, a container including a filter to separate dust and air. Thesuction nozzle 54 is mounted at the distal end of theduct 53. - When the
vacuum cleaner 5 is turned on, power is supplied to theelectric blower 51a and theelectric blower 51a can thus be driven. During driving of theelectric blower 51a, dust is sucked up from thesuction nozzle 54 by the suction force produced by theelectric blower 51a. The dust sucked up from thesuction nozzle 54 passes through theduct 53 and then is collected in thedust chamber 52. The air sucked up from thesuction nozzle 54 passes through theelectric blower 51a and then is exhausted outside thevacuum cleaner 5 from theexhaust port 51b. - The
vacuum cleaner 5 according to Embodiment 4 includes the electric blower described in any ofEmbodiments 1 to 3, and therefore has the same effect as that described in any ofEmbodiments 1 to 3. - In addition, with the
vacuum cleaner 5 according to Embodiment 4, since an increase in pressure loss in theelectric blower 51a is kept down and the aerodynamic efficiency is thus improved, the vacuum cleaner having high suction power can be provided. -
FIG. 26 is a perspective view schematically illustrating ahand dryer 6 as a hand drying device according toEmbodiment 5. - The
hand dryer 6 serving as a hand drying device includes a housing 61 (also called a casing) and anelectric blower 64. Thehousing 61 includes anair inlet 62 and anair outlet 63. Theelectric blower 64 is fixed in thehousing 61. - The
electric blower 64 is theelectric blower 1 according to Embodiment 1 (including each Modification), theelectric blower 2 according to Embodiment 2 (including each Modification), or theelectric blower 3 according to Embodiment 3 (including each Modification). Theelectric blower 64 performs air suction and blowing air by generating an air current. More specifically, theelectric blower 64 sucks up air exterior to thehousing 61 through theair inlet 62 and sends the air outside thehousing 61 through theair outlet 63. - When the
hand dryer 6 is turned on, power is supplied to theelectric blower 64 and theelectric blower 64 can thus be driven. During driving of theelectric blower 64, air exterior to thehand dryer 6 is sucked up from theair inlet 62. The air sucked up from theair inlet 62 passes through the inside of theelectric blower 64 and then is exhausted from theair outlet 63. When a user of thehand dryer 6 puts his or her hand near theair outlet 63, droplets of water on the hand can be blow away and the hand can be dried. - The
hand dryer 6 according toEmbodiment 5 includes the electric blower described in any ofEmbodiments 1 to 3, and therefore has the same effect as that described in any ofEmbodiments 1 to 3. - In addition, with the
hand dryer 6 according toEmbodiment 5, since an increase in pressure loss in theelectric blower 64 is kept down and the aerodynamic efficiency is thus improved, the vacuum cleaner having highly efficient can be provided. - The features in the Embodiments and the features in the Modifications described above can be combined with each other as appropriate.
- 1, 1a, 1b, 1c, 1d, 1e, 2, 2a, 2b, 2c, 3, 3a, 51a, 64 electric blower; 5 vacuum cleaner; 6 hand dryer; 10, 10a, 10b, 100, 100a, 100b, 100c motor; 11, 11a, 11b, 11c, 111, 111a, 111b, 111c motor frame; 12 stator; 13 rotor; 14 shaft; 15a, 15b bearing; 16 stationary blade support portion; 20, 20d housing; 21 first portion; 22 second portion; 23 third portion; 24 fourth portion; 25 motor support portion; 26a first opening; 26b second opening; 30 air blowing unit; 31 moving blade; 32 stationary blade; 33 baffle plate; 114 guide portion.
Claims (15)
- An electric blower comprising:an air blowing unit including a mixed-flow fan to generate a current of air;a permanent magnet synchronous motor to rotate the mixed-flow fan; anda housing including a first opening, a second opening communicating with the first opening, a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the permanent magnet synchronous motor in the circumferential direction,wherein an inner diameter of the second portion is smaller than an inner diameter of the first portion.
- The electric blower according to claim 1, wherein
the housing includes a third portion provided between the first portion and the second portion, and
the third portion is formed integrally with the first portion and the second portion. - The electric blower according to claim 2, further comprising a first path formed between the first portion and the air blowing unit and to allow the air to flow in a first direction.
- The electric blower according to claim 3, wherein the permanent magnet synchronous motor includes a guide portion provided inside the third portion in a radial direction and to guide the air in a second direction.
- The electric blower according to claim 4, further comprising a second path formed between the third portion and the guide portion and to allow the air to flow in the second direction.
- The electric blower according to claim 5, wherein a width of the second path in a direction perpendicular to the second direction is larger than a width of the first path in a direction perpendicular to the first direction.
- The electric blower according to claim 5 or 6, further comprising a third path formed between the second portion and the permanent magnet synchronous motor and to allow the air to flow in a third direction.
- The electric blower according to claim 7, wherein a width of the third path in a direction perpendicular to the third direction is larger than a width of the first path in a direction perpendicular to the first direction.
- The electric blower according to claim 7 or 8, wherein a width of the third path in a direction perpendicular to the third direction is larger than a width of the second path in a direction perpendicular to the second direction.
- The electric blower according to any one of claims 1 to 9, wherein
the permanent magnet synchronous motor includes:a motor frame;a stator fixed inside the motor frame; anda rotor inserted inside the stator, andwherein the motor frame includes a through hole through which the air passes. - The electric blower according to any one of claims 1 to 10, wherein during rotation of the mixed-flow fan, the air flows toward the second opening.
- The electric blower according to any one of claims 1 to 11, wherein the air blowing unit includes a stationary blade.
- The electric blower according to claim 12, further comprising a baffle plate provided between the stationary blade and the permanent magnet synchronous motor and to guide an air current generated by rotation of the mixed-flow fan toward the permanent magnet synchronous motor.
- A vacuum cleaner comprising:an electric blower to produce suction force; anda dust chamber in which dust sucked up by the suction force is collected,the electric blower including:an air blowing unit including a mixed-flow fan to generate a current of air;a permanent magnet synchronous motor to rotate the mixed-flow fan; anda housing including a first opening, a second opening communicating with the first opening, a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the permanent magnet synchronous motor in the circumferential direction,wherein an inner diameter of the second portion is smaller than an inner diameter of the first portion.
- A hand drying device comprising:a casing including an air inlet and an air outlet; andan electric blower fixed in the casing, and to suck up air exterior to the casing through the air inlet and send the air outside the casing through the air outlet,the electric blower including:an air blowing unit including a mixed-flow fan to generate a current of air;a permanent magnet synchronous motor to rotate the mixed-flow fan; anda housing including a first opening, a second opening communicating with the first opening, a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the permanent magnet synchronous motor in the circumferential direction,wherein an inner diameter of the second portion is smaller than an inner diameter of the first portion.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2017/022989 WO2018235221A1 (en) | 2017-06-22 | 2017-06-22 | Electric air blower, electric vacuum cleaner, and hand drier device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3643925A1 true EP3643925A1 (en) | 2020-04-29 |
EP3643925A4 EP3643925A4 (en) | 2020-06-17 |
Family
ID=64736934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17914605.5A Pending EP3643925A4 (en) | 2017-06-22 | 2017-06-22 | Electric air blower, electric vacuum cleaner, and hand drier device |
Country Status (4)
Country | Link |
---|---|
US (1) | US11454246B2 (en) |
EP (1) | EP3643925A4 (en) |
JP (1) | JP6719670B2 (en) |
WO (1) | WO2018235221A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3101117B1 (en) * | 2019-09-25 | 2021-10-08 | Sifat Aeraulique | Improved efficiency axial centrifugal fan |
KR20220007360A (en) * | 2020-07-10 | 2022-01-18 | 엘지전자 주식회사 | Air circulator and air cleaner including air circulator |
Family Cites Families (21)
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US2658665A (en) * | 1950-12-07 | 1953-11-10 | Hoover Co | Multistage fan for suction cleaners |
JPS6270697A (en) | 1985-09-20 | 1987-04-01 | Matsushita Electric Ind Co Ltd | Electric motor fan |
JP3747630B2 (en) | 1998-05-25 | 2006-02-22 | 松下電器産業株式会社 | Electric blower |
JP3532779B2 (en) | 1998-12-17 | 2004-05-31 | シャープ株式会社 | Fan motor device and recirculating vacuum cleaner |
JP2000249098A (en) | 1999-02-26 | 2000-09-12 | Hitachi Ltd | Motor-driven blower and electric vacuum cleaner |
JP2000316747A (en) * | 1999-05-10 | 2000-11-21 | Mitsubishi Electric Corp | Drier |
JP2005307985A (en) * | 2005-06-17 | 2005-11-04 | Matsushita Electric Ind Co Ltd | Electric blower for vacuum cleaner and vacuum cleaner using same |
FR2908482B1 (en) | 2006-11-13 | 2010-04-02 | Airfan | REGULATED DELIVERY APPARATUS FOR A GAS, PARTICULARLY RESPIRATORY ASSISTANCE APPARATUS |
JP2011052591A (en) * | 2009-09-02 | 2011-03-17 | Panasonic Corp | Electric blower and vacuum cleaner using the same |
JP2012202282A (en) * | 2011-03-25 | 2012-10-22 | Panasonic Corp | Electric blower and electric cleaner using the same |
JP2013024134A (en) | 2011-07-21 | 2013-02-04 | Panasonic Corp | Electric blower and vacuum cleaner |
JP2013079625A (en) | 2011-10-05 | 2013-05-02 | Mitsubishi Electric Corp | Electric centrifugal blower and vacuum cleaner using the same |
KR101331666B1 (en) * | 2011-12-29 | 2013-11-20 | 삼성전기주식회사 | Fan motor assembly |
JP6155544B2 (en) * | 2012-03-12 | 2017-07-05 | 日本電産株式会社 | Centrifugal fan |
JP6011914B2 (en) | 2012-07-05 | 2016-10-25 | 日本電産株式会社 | Centrifugal fan |
GB2513664B (en) * | 2013-05-03 | 2016-01-06 | Dyson Technology Ltd | Compressor |
JP6417771B2 (en) | 2014-07-31 | 2018-11-07 | 日本電産株式会社 | Electric blower |
MX2016006402A (en) * | 2015-05-21 | 2016-11-21 | Johnson Electric Sa | Single-phase motor, airflow generating device, and electric apparatus. |
EP3133723A1 (en) | 2015-08-18 | 2017-02-22 | Johnson Electric S.A. | Fluid generating device and electric apparatus using the same |
JP6717029B2 (en) | 2015-11-09 | 2020-07-01 | 日本電産株式会社 | Blower and cleaning equipment |
JP2018105269A (en) * | 2016-12-28 | 2018-07-05 | 日本電産株式会社 | Blowing device and cleaner equipped with the same |
-
2017
- 2017-06-22 WO PCT/JP2017/022989 patent/WO2018235221A1/en active Application Filing
- 2017-06-22 EP EP17914605.5A patent/EP3643925A4/en active Pending
- 2017-06-22 JP JP2019524793A patent/JP6719670B2/en active Active
- 2017-06-22 US US16/606,800 patent/US11454246B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3643925A4 (en) | 2020-06-17 |
WO2018235221A1 (en) | 2018-12-27 |
JPWO2018235221A1 (en) | 2019-11-07 |
US11454246B2 (en) | 2022-09-27 |
JP6719670B2 (en) | 2020-07-08 |
US20200318646A1 (en) | 2020-10-08 |
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